Sterlingworth co 12 gauge double barrel info

I just bought a Sterlingworth co. Double barrel 12 gauge. The serial number shows it as a 1910 model the best I can tell. This is the first year they were made. It still shoots and is very tight still. At some point someone did a silver overlay on it in places with some engraving. I know that probably hurts the value since it’s not original, but it was my dad’s cousins who passed away, so I will more than likely never sell it. My dad lived with his cousin when they were teenagers, and although overtime they didn’t stay super close, his wife reached out to us after he passed asking if we were interested in buying it. I decided to. I may have slightly overpaid, but it’s still cool to own a 116 year old working firearm. I wish it could talk! Anyway, I know CSB, but does anyone know much about them value wise? I see them on auction on gunbroker from $795-$15,000.